Activated Carbon Nanoparticles Research Articles

When Chemicals Go to the Dark Side

When Chemicals Go to the Dark Side

Activated Carbon Nano-Particles from Recycled Polymers Waste as a Novel Nano-Additive to Grease Lubrication

A worldwide growing trend is dedicated towards reducing carbon dioxide emissions from mechanical systems in different industries. One key factor under focus of research is to decrease energy losses in rotating machinery during operation by improving lubrication performance. This paper presents a novel grease nano-additive using activated carbon (AC) as a byproduct from recycled polymer waste. Five different concentrations of AC nanoparticles (ACNPs) are added to lithium grease to obtain blends containing 0.025 wt.%, 0.05 wt.%, 0.1 wt.%, 0.5 wt.%, and 1 wt.%. The tribological assessment of blends has been performed using a four-ball wear test and load carrying capacity test. The obtained results for blends are compared to samples of base grease and to blends with 2 wt.% reduced graphene oxide (rGO). Test results showed a remarkable enhancement of load carrying capacity of AC samples by 20–30% as compared to base grease. By observing wear scar in rolling elements, the ACNPs lowered the average wear scar diameter (WSD) for all samples by 30–36%. Base grease samples showed the highest coefficient of friction (COF) values between 0.15 and 0.17. These values are reduced to 0.03 and 0.06 for grease with ACNPs reaching their minimum in the case of 1 wt.% AC. These outcomes are found consistent with the enhancements in driving power saving values. The results proved the competitiveness and suitability of the AC as a recycled waste and nano-additive for improving the tribological performance of grease lubrication.

Fabrication of high efficiency coronavirus filter using activated carbon nanoparticles.

In this study design and fabrication of coronavirus filter based on the cellulose and carbon nanomaterials have been investigated. Particulate matter (PM) corona virus has attracted a lot of attention due to its great threat to human health. Nanoparticles are intertwined with fibers and form highly porous air filter paper. The structure of the filter has been characterized using scanning electron microscope (SEM) and Brunauer–Emmett–Teller (BET) analysis. In addition, by optimization with activated carbon (AC) nanoparticles, the prepared AC air filter paper shows a high removal efficiency of more than 95% for PM 100 nm. More importantly, this filter shows less pressure drop and less thickness. This filter has a positive effect on the prevention of this disease during the coronavirus epidemic and show high absorption efficiency air filter for PM more than 100 nm.

Removal of mercury (II) from aqueous solution by powdered activated carbon nanoparticles prepared from beer barley husk modified with Thiol/ Fe3O4

In the present study, activated carbon from beer barley husk (PAC) using dual-stage chemical activation was magnetized with Fe3O4, and then thiol-modified through the facile and safe hydrothermal method which creates thiol magnetic activated carbon adsorbent (mPAC-SH). The physical and chemical properties of all samples were characterized by XRD, FT-IR, SEM, BET and VSM. The prepared adsorbent was used as an effective adsorbent to removal of mercury (II) from wastewater. The influence of adsorption parameters such as pH, initial concentration of mercury (II), contact time, mPAC-SH dose, and the effect of temperature on the removal of mercury (II) ions was investigated. The results of this study indicated that the highest rate for removal of mercury (II) about 99.44% was observed under optimum conditions in the pH= 6, mercury (II) concentrations about 20 mg L−1, adsorbent dose of 0.4 gL−1 and the contact time of 60 min. Based on the Langmuir model maximum adsorption capacity of Hg (II) was determined as 109.37 mg/g. The sorption mechanism of mPAC -SH on mercury (II) follows the Freundlich isotherm adsorption model with a correlation coefficient of 0.99. The kinetic data has the best correlation with the pseudo-second-order (PSO) kinetics equation with a correlation coefficient about 0.99. The thermodynamic study results showed that the adsorption of mercury (II) ions is endothermic and spontaneous. The mPAC-SH magnetic nanocomposite could be reused after five successive adsorption-desorption cycles of mercury (II) removal without any significant loss of adsorption capacity.

Fabrikasi Ramah Lingkungan Komposit Nano Karbon Aktif-Partikel Perak dan Uji Aktifitas Antibakterinya

Nanocomposite of activated carbon-silver nanoparticles (AC-AgNPs) have been successful greenly fabricated using ultrasonic (40 kHz; 2´50 watt) for various time of 10-, 20-, and 30-minutes agitation. The research was aiming to investigate the relationship of ultrasonic agitation times and antibacterial activity of the associated nanocomposite mentioned. For that, the first step performed was synthesize silver nanoparticles (AgNPs) from silver nitrate salt (AgNO3) (10 ml,3 mM) using aqueous-pineapple extract of various concentration of approximately 10, 20, 30, 40 and 50 % w/v. The second step was fabricated activated carbon nanoparticles (ACNPs) from local commercially available carbon black fine powder through the advanced top-down method. Finally, properly mixed the produced ACNPs and AgNPs under ultrasonic agitation as mentioned above. Analysis and characterization of the desired produced materials were conducted by using Ultra violet-visible (UV-Vis) spectroscopy, Transmission electron microscopy (TEM), and Fourier transformed infrared (FTIR) spectroscopy. It was well known that about 10-50 nm in size of AgNPs were successful produced with spherical particles in shape. The AgNPs could then be incorporated and spread out evenly on the surface of the ACNPs matrix. In this situation, FTIR spectra confirmed that the AgNPs mentioned particularly interact with each other with hydroxyl (-OH) and carbonyl (C=O) groups existing on the surface of the ACNPs matrix. The antibacterial activity of the produced AC-AgNPs nanocomposite was separately tested toward both E. coli and S. aureus bacterial using agarose-filter paper disc method. It was known that the clear zone generated around the disc was about 1.23 mm and 2.07 mm in averages for Eschericia coli (E. coli) and Staphylococus aureus (S. aureus) respectively.

Buoyant oleophilic magnetic activated carbon nanoparticles for oil spill cleanup

In response to oil spills, it is imperative to develop efficient and eco-friendly sorbent materials. Oil remediation techniques are limited, prompting researchers to look into using nanotechnology for oil cleanup. Therefore, magnetic Fe3O4 composite nanoparticles (MNPs) were synthesized by the chemical co-precipitation method. The MNPs were then coated with activated carbon (AC) layer, followed by soybean oil/stearic acid surface decoration. The morphology and surface properties of the material were characterized using a scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET), and contact angle (CA) analyses. The results showed an excellent amphiphilicity with water CA of 0° and oil CA of nearly 0°. In terms of applicability for oil recovery operations, the fabricated nanocomposite revealed sorption capacities greater than 6.5 g/g for a range of oils. In addition, the sorbent can be reused at least five times with advantageous characteristics for selective oil recovery on surface waters owning to its intense super-paramagnetic properties. Considering our results, we suggest that there is a practical application for magnetic AC nanomaterials in spilled oil response.

Potential of chitosan/carbon nanoparticles and chitosan/lignocellulose nanofiber composite as growth media for peatland paddy seeds

Indonesia has committed to restoring degraded peatlands by revegetating them with paddy plants using paludiculture systems. Nanofertilizers derived from chitosan and oil palm biomass can be used to enhance paddy growth. This study analyzed the potential growth media of chitosan nanocomposite films for paddy seeds grown in tropical peatland. Chitosan nanocomposites were synthesized by reinforcing chitosan with activated carbon nanoparticles (ACNPs), nonactivated carbon nanoparticles (n-ACNPs), and lignocellulose nanofibers (LCNFs). All carbon nanoparticles were reversibly aggregated, whereas LCNFs did not have a tendency to aggregate but were entangled. The highest specific surface area and pore volume are on EFB ACNPs, followed by OPT LCNFs and EFB n-ACNPs. Both nanocomposites' tensile strength and elastic modulus value were reduced with an average of 45.77% and 34.00%, respectively, because of the lack of nano- and micro-aggregates formation, good dispersion, and incompatibility. In a germination test, chitosan nanocomposites provided the best growth patterns for the Dendang paddy variety, whereas, in a greenhouse test, the nanocomposites had the best growth patterns for the Indragiri paddy variety. Chitosan/empty fruit bunch ACNP nanocomposites grown in a germinator had the highest growth normality (100.00%), highest maximum growth potential (100.00%), and highest height average (11.27 cm). In the greenhouse test, chitosan/oil palm trunk n-ACNPs achieved the highest growth natality (16.44%) and growth rate (65.74%). All chitosan nanocomposites had a synergetic biofertilizing effect on fungi and mycorrhiza. Chitosan nanocomposites can be used as a growth regulator for peatland paddy varieties and can accelerate peatland restoration in tropical areas.

A novel solar absorber using activated carbon nanoparticles synthesized from bio-waste for the performance improvement of solar desalination unit

Enhancing the efficiency of low-cost solar-powered desalination technologies such as solar stills (SS) is essential to ensuring sustained access to potable water in water-stressed areas. In the present work, the potential enhancement of SS performance through the addition of different concentrations of activated carbon nanoparticles (ACNPs) to the standard black paint used to coat the absorber plate was explored. SSs were fabricated with absorber coated using black paint doped with 0, 5, 10 and 15 wt% ACNPs (denoted as CSS, MSS-5, MSS-10 and MSS-15, respectively) and the effect on water temperature and distillation efficiency determined. ACNPs were synthesized by crushing dead Kigelia Africana leaves and pyrolysis of the leaf powder in a muffle furnace at 500 °C. Absorber surface roughness analysis illustrated increasing roughness with increasing the loading of ACNPs in the nano-paint, leading to significant increase in heat transfer. Significant improvement in average water temperature (12.5%) and absorber (14.5%) was noted in the modified SS coated with 15 wt% ACNP over the CSS. The augmented temperature of this still enhanced the peak hourly and full-day water yield of MSS-15 by ⁓39.3%, compared to the conventional SS. The water quality analysis shows that the distilled water is appropriate for drinking. In conclusion, the synergetic effect of the high thermal conductivity and excellent solar absorption of the ACNP-based solar absorber improves the performance of the SS unit.

Structural and Electrochemical Properties of Physically and Chemically Activated Carbon Nanoparticles for Supercapacitors.

The demand for supercapacitors has been high during the integration of renewable energy devices into the electrical grid. Although activated carbon materials have been widely utilized as supercapacitor electrodes, the need for economic and sustainable processes to extract and activate carbon nanomaterials is still crucial. In this work, the biomass waste of date palm fronds is converted to a hierarchical porous nanostructure of activated carbon using simple ball-milling and sonication methods. Chemical and physical activation agents of NaOH and CO2, receptively, were applied on two samples separately. Compared with the specific surface area of 603.5 m2/g for the CO2-activated carbon, the NaOH-activated carbon shows a higher specific surface area of 1011 m2/g with a finer nanostructure. Their structural and electrochemical properties are functionalized to enhance electrode–electrolyte contact, ion diffusion, charge accumulation, and redox reactions. Consequently, when used as electrodes in an H2SO4 electrolyte for supercapacitors, the NaOH-activated carbon exhibits an almost two-fold higher specific capacitance (125.9 vs. 56.8 F/g) than that of the CO2-activated carbon at the same current density of 1 A/g. Moreover, using carbon cloth as a current collector provides mechanical flexibility to our electrodes. Our practical approach produces cost-effective, eco-friendly, and flexible activated carbon electrodes with a hierarchical porous nanostructure for supercapacitor applications.

Surface Modification of Nanofiltration Membrane Using Poly(vinyl alcohol) and Chitosan-Functionalized Activated Carbon Nanoparticles

فرضیه: غشای لایه نازک نانوفیلتری با پلی(وینیل الکل) و نانوذرات کربن فعال عامل‌دار‌شده با کیتوسان اصلاح شدند. اثر لایه سطحی ایجادشده بر ساختار و خواص جداسازی غشاها بررسی شد.روش‌ها: از تصویربرداری میکروسکوپی الکترونی، طیف‌سنجی زیرقرمز، اندازه‌گیری مقدار آب، تخلخل و متوسط اندازه حفره‌ها، جداسازی نمک‌های سدیم کلرید و سولفات، شار آب و مقدار بازگشت‌پذیری شار در برابر گرفتگی برای ارزیابی غشاها استفاده شد.یافته‌ها: نتایج طیف‌سنجی زیرقرمز حاکی از تأیید گروه‌های هیدروکسیل و آمین بر سطح غشاهای اصلاح‌شده است. عکس‌های میکروسکوپی الکترونی تشکیل لایه‌ای یکنواخت را روی سطح غشاهای اصلاح‌شده نشان می‌دهد. در عکس‌ها دیده می‌شود، با افزودن نانوذرات به پلی(وینیل الکل)، ساختاری ناهمگن و متراکم بر سطح غشاها شکل گرفته است. اصلاح غشای اولیه با استفاده از پلی(وینیل الکل) و نانوذرات اصلاح‌شده کربن فعال تا %0.25 وزنی در ابتدا سبب بهبود مقدار آب شد و با افزایش مقدار نانوذرات از %0.25 تا %1 وزنی دوباره مقدار آب غشا کاهش یافت. نتایج نشان داد، تمام غشاهای اصلاح‌شده، متوسط اندازه حفره‌های بزرگ‌تری در مقایسه با غشای اصلاح‌نشده دارند. همچنین تمام نمونه‌های اصلاح‌شده شار آب بیشتری از غشای اولیه دارند. افرون بر این نتایج پس‌زنی نمک نشان داد، اصلاح سطح غشاها اثر مثبتی در جلوگیری از کاهش مقدار پس‌زنی با وجود افزایش مقدار شار داشته است. مقدار پس‌زنی نمک سدیم سولفات بیشتر از پس‌زنی سدیم کلرید اندازه‌گیری شد. مقدار بازیابی شار در نمونه‌های اصلاح‌شده بیشتر از %92 و در نمونه اولیه بیش از %66 ارزیابی شد که حاکی از بهبود خاصیت ضدگرفتگی غشاهای اصلاح‌شده است.

The role of activated carbon nanoparticles on hydro-degumming non-edible vegetable oils

This study aims to assess the role of activated carbon nanoparticles in hydro-degumming non-edible vegetable oils. Bamboo Activated Carbon Nanoparticles (BAC-NPs) is added to oils in degumming process. Characterizations revealed mesoporous structures with specific surface area 673.298 m2/g, positive surface charge, aromatic ring cluster, and increased hydrophilicity. Magnetic moment induced by delocalized electrons in aromatic ring cluster of BAC-NPs works towards paramagnetic negatively charged oxygen around the phosphate head group of phospholipid molecule. It also works towards water molecules, changes water proton spin isomer from para to ortho, decreases intramolecular energy in water, facilitates base-promoted ester hydrolysis reaction. These phenomena, combined with heat energy and centrifugation force, trigger bonds disruption within phospholipid molecule, lead to a higher probability of phosphate head group detachment off the phospholipid molecule. As a result, there is a large reduction in phosphorus concentration (around 95%) and a slight improvement in viscosity and calorific value in treated oils.

Green Synthesized Silver Nanoparticles Immobilized on Activated Carbon Nanoparticles: Antibacterial Activity Enhancement Study and Its Application on Textiles Fabrics.

This research aimed to enhance the antibacterial activity of silver nanoparticles (AgNPs) synthesized from silver nitrate (AgNO3) using aloe vera extract. It was performed by means of incorporating AgNPs on an activated carbon nanoparticle (ACNPs) under ultrasonic agitation (40 kHz, 2 × 50 watt) for 30 min in an aqueous colloidal medium. The successful AgNPs synthesis was clarified with both Ultraviolet-Visible (UV-Vis) and Fourier Transform Infrared (FTIR) spectrophotometers. The successful AgNPs–ACNPs incorporation and its particle size analysis was performed using Transmission Electron Microscope (TEM). The brown color suspension generation and UV-Vis’s spectra maximum wavelength at around 480 nm confirmed the existence of AgNPs. The particle sizes of the produced AgNPs were about 5 to 10 nm in the majority number, which collectively surrounded the aloe vera extract secondary metabolites formed core-shell like nanostructure of 8.20 ± 2.05 nm in average size, while ACNPs themselves were about 20.10 ± 1.52 nm in average size formed particles cluster, and 48.00 ± 8.37 nm in average size as stacking of other particles. The antibacterial activity of the synthesized AgNPs and AgNPs-immobilized ACNPs was 57.58% and 63.64%, respectively (for E. coli); 61.25%, and 93.49%, respectively (for S. aureus). In addition, when the AgNPs-immobilized ACNPs material was coated on the cotton and polyester fabrics, the antibacterial activity of the materials changed, becoming 19.23% (cotton; E. coli), 31.73% (polyester; E. coli), 13.36% (cotton; S. aureus), 21.15% (polyester; S. aureus).

Tribological Study of Activated Carbon Nanoparticle in Nonedible Nanofluid for Machining Application

Tribological Study of Activated Carbon Nanoparticle in Nonedible Nanofluid for Machining Application

Self-activated ‘green’ carbon nanoparticles for symmetric solid-state supercapacitors

Tuning of porosity and surface properties of nanoparticles especially on carbon-based nanomaterials, adopting a ‘greener’ or self-activation synthesis technique for electrical charge storage, is progressing. Herein, we report the self-activation of Teak wood sawdust in a nitrogen atmosphere at different activation temperatures to synthesize carbon nanoparticles. The activated carbon nanoparticles synthesized at 900 °C exhibits a maximum ~ 360 m2 g−1 surface area with ~ 2 nm average pore size diameter. Five electrolytes viz. KOH, KCl, Na2SO4, NaCl, and H3PO4 are used for studying the supercapacitance nature of the activated carbon nanoparticles in a 3-electrode configuration. A maximum specific capacitance of ~ 208 F g−1 @ 0.25 A g−1 is obtained in 1 M KOH as the electrolyte. Two symmetric supercapacitors, aqueous (1 M KOH) and solid-state (PVA/KOH), are fabricated, and their performance difference is compiled. The solid-state symmetric supercapacitor performs in a wider voltage window (1.7 V) with a superior energy density of 27.1 Wh kg−1 at a power density of 178 W kg−1.

Sustainable approaches for removal of cephalexin antibiotic from non-clinical environments: A critical review

In this article, the removal of cephalexin (CFX) antibiotic from non-clinical environment is reviewed. Adsorption and photocatalytic degradation techniques are widely used to remove CFX from waters and wastewaters, the combination of these methods is becoming more common for CFX removal. The treatment methods of CFX has not been reviewed before, the present article aim is to organize the scattered available information regarding sustainable approaches for CFX removal from non-clinical environment. These include adsorption by nanoparticles, bacterial biomass, biodegradation by bacterial enzymes and the photocatalysis using different catalysts and Photo-Fenton photocatalysis. The metal-organic frameworks (MOFs) appeared to have high potential for CFX degradation. It is evident from the recently papers reviewed that the effective methods could be used in place of commercial activated carbon. The widespread uses of photocatalytic degradation for CFX remediation are strongly recommended due to their engineering applicability, technical feasibility, and high effectiveness. The adsorption capacity of the CFX is ranging from 7 mg CFX g−1 of activated carbon nanoparticles to 1667 mg CFX g−1 of Nano-zero-valent iron from Nettle. In contrast, the photo-degradation was 45% using Photo-Fenton while has increased to 100% using heterogeneous photoelectro-Fenton (HPEF) with UVA light using chalcopyrite catalyst.

Large Optical Nonlinearity of the Activated Carbon Nanoparticles Prepared by Laser Ablation.

Carbon nanoparticles (CNPs) with high porosity and great optical features can be used as a luminescent material. One year later, the same group investigated the NLO properties CNPs and boron-doped CNPs by 532 nm and 1064 nm laser excitations to uncover the underlying physical mechanisms in their NLO response. Hence, a facile approach, laser ablation technique, was employed for carbon nanoparticles (CNPs) synthesis from suspended activated carbon (AC). Morphological properties of the prepared CNPs were studied by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). UV-Vis and fluorescence (FL) spectra were used to optical properties investigation of CNPs. The size distribution of nanoparticles was evaluated using dynamic light scattering (DLS). The nonlinear optical (NLO) coefficients of the synthesized CNPs were determined by the Z-scan method. As a result, strong reverse saturable absorption and self-defocusing effects were observed at the excitation wavelength of 442 nm laser irradiation. These effects were ascribed to the presence of delocalized π-electrons in AC CNPs. To the best of our knowledge, this is the first study investigating the NLO properties of the AC CNPs.

Coconut-shell-derived activated carbon for NIR photo-activated synergistic photothermal-chemodynamic cancer therapy

Exploiting new non-metal-based peroxidase-mimic nanoenzymes for chemodynamic therapy (CDT) in cancer treatment is an active and challenging field. Here, we found that activated carbon nanoparticles (denoted as ANs) fabricated from coconut shell have satisfactory peroxidase-mimic nanoenzyme activity. Based on this positive result, gadodiamide, a clinically used nuclear magnetic imaging contrast agent, was loaded inside the AN pores and encapsulated by polyvinylpyrrolidone (PVP) to obtain Gd@PANs. PANs (ANs modified using PVP) efficiently catalyze the massive decomposition of endogenous hydrogen peroxide (H2O2) inside cancer cells to produce toxic oxidized hydroxyl radicals (˙OH) for the CDT treatment of cancer, but they showed no toxicity toward normal cells. Additionally, under 808 nm laser irradiation, the photothermal conversion efficiency of the PANs reaches 45.20%, ensuring their effective photothermal therapy (PTT) treatment functionality. Simultaneously, during PTT treatment, the heating effect significantly enhances the peroxidase-mimic activity of the PANs to achieve an ideal PTT-CDT synergistic therapeutic outcome. Gd@PANs can also be used for the T1-magnetic resonance imaging (MRI) of tumors to integrate treatment and diagnosis.

Synthesis and characterization of Titanium doped activated carbon nanoparticles and its application for the removal of dicofol

Dicofol is an agricultural insecticide consisting of organochlorine acaricide and is structurally similar to DDT, but contains a central hydroxyl group that allows more rapid environmental and metabolic removal. It has been used in agriculture since the late 1980’s. Products containing dicofol have been registered for broad spectrum contact, non-systemic control of plant eating mites in cotton tea and a wide variety of fruits, vegetables and ornamental crops. Dicofol is moderately toxic to humans and may be absorbed through ingestion, inhalation or skin contact. It is also highly toxic to aquatic organisms. Several methods were used to remove the dicofol concentration from waste water such as, adsorption, absorption, solvent extraction, etc. The present work is concentrated on the removal of dicofol from synthetic dicofol solution using adsorption. The adsorbent used in the work is Titanium doped activated carbon nano particles (Ti-AC np). The experimentation is carried out and the optimum conditions for the removal of dicofol are found as contact time of 89.12, initial concentration of 90.56, pH of 97.56, rpm at 97.88 and at a temperature of 318 K. The final removal percentage obtained under optimum conditions is 97.3%. Further, the adsorption kinetics and thermodynamic studies are also discussed.

Separation of aniline from water and wastewater samples based on activated carbon nanoparticles and dispersive solid phase extraction procedure

The water, wastewater and air are the main sources of aniline in environment. Aniline has a toxic effect in the human body and environment and so, must be determined by novel techniques. In this study, the activated carbon with microwave heating methods (MHM-ACNPs) were used for extraction aniline from waters by dispersive ionic liquid solid phase extraction procedure (D-IL-SPE) and compared to the activated carbon (AC). For this purpose, the mixture of acetone, ionic liquid and 30 mg of MHM-ACNPs/AC added to 100 mL of water samples at pH=8. After sonication for 10 min, the benzene ring in aniline as electron acceptor was chemically adsorbed on carboxylic groups of MHM-ACNPs as electron donors (MHM-ACNPs-COO─……C6H5-NH2) and then, the adsorbent was collected by IL phase in bottom of conical centrifuging tube. Finally, the aniline was released from MHM-ACNPs in remained solution by changing pH and the concentration of aniline determined by GC-FID.

Application of Carbon Nanoparticles in Tracing Lymph Nodes and Locating Tumors in Colorectal Cancer: A Concise Review.

BackgroundAccurate lymph node (LN) staging has considerably prognostic and therapeutic value in patients with colorectal cancer (CRC). The purpose of this study is to evaluate the feasibility of applying carbon nanoparticles (CNPs) to track LN metastases in CRC.MethodsTwo researchers independently screened publications in PubMed, EMBASE, Cochrane and Ovid MEDLINE databases. The keywords were (carbon nanoparticles OR activated carbon nanoparticles) AND (colon cancer OR rectal cancer OR colorectal cancer). Titles and abstracts of the articles were meticulously read to rule out potential publications. Next, full texts of the ultimately obtained eligible publications were retrieved and analyzed in detail.ResultsThe search produced 268 publications, and 140 abstracts were identified after a bibliographic review. Finally, 20 studies relevant to our subject were obtained; however, only 14 papers met our inclusion criteria and were included for final review. All studies included have compared the control group with carbon nanoparticles group (control group, defined as nontattooed group; and carbon nanoparticles group, defined as administering carbon nanoparticles during surgery) for their efficacy in intraoperative detecting and positioning. After analysis, appreciably less amount of bleeding (3/5 trials), shorter operation time (2/4 trials), and shorter time to detect lesions and dissect LNs (2/2 trials) were revealed in CNPs group compared to control group. Thirteen studies have recorded the numbers of the harvested LNs in both groups; meanwhile, CNPs group shows superiority to control group in LN retrieval as well (11/13 trials), which also could effectively aid in locating and harvesting more LNs with diameter below 5 mm.ConclusionThe tracing technique for CNPs is a safe and useful strategy both in localizing tumor and tracing LNs in CRC surgery. But there is still a need for more randomized controlled trials to further establish its contribution to patient survival.